|Publication number||US6397647 B1|
|Application number||US 09/798,973|
|Publication date||Jun 4, 2002|
|Filing date||Mar 6, 2001|
|Priority date||Mar 6, 2001|
|Publication number||09798973, 798973, US 6397647 B1, US 6397647B1, US-B1-6397647, US6397647 B1, US6397647B1|
|Original Assignee||Lambert Kuo|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Referenced by (24), Classifications (9), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to a protective cover for a keyhole of a lock and, more particularly, to such a protective cover having a compact and simple structure.
2. Description of Related Art
Protective covers for keeping dust and moisture from entering keyholes are well known in the art. FIG. 5 illustrates such a protective cover including a cap (40) rotatably connected to a lock (50).
The cap (40) has a crown (43) formed with a central opening in alignment with a keyhole of the lock (50). Pivotally connected to the cap (40) at sides of the opening is a pair of doors (41) that normally close the opening under the action of respective torsion springs (42). As shown in FIG. 6, the doors (41) can be opened by a key prior to its insertion into the keyhole. Due to the springs (42), the doors (41) will close automatically at the exact moment when the key is removed from the lock (50).
This protective cover is satisfactory in keeping out dust and moisture which would otherwise impair working of the lock. However, the pivotal arrangement of the doors (41) necessitates a large space for their turning, which makes the cap (40) too bulky. Furthermore, the cover includes the torsion springs, each of which must be fabricated and assembled with the other parts, and so the total cost for the cover is relatively high.
Therefore, it is an objective of the invention to provide a protective cover for a keyhole of a lock to mitigate and/or obviate the aforementioned problems.
The object of the present invention is to provide a protective cover for a lock which is compact in structure.
Another object of the present invention is to provide a protective cover for a lock which is simple in structure.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
FIG. 1 an exploded perspective view of a preferred embodiment of a protective cover in accordance with the present invention for a keyhole of a lock;
FIG. 2 is a fragmentary cross-sectional view of the protective cover shown in FIG. 1;
FIG. 3 is a side view showing the cover in a closed position;
FIG. 4 is a side view showing the cover in an open position;
FIG. 5 is a cross-sectional view showing a conventional protective cover in a closed position;, and
FIG. 6 is a cross-sectional view showing the conventional protective cover of FIG. 5 in an open position.
Referring to FIGS. 1 and 2, there is shown a preferred embodiment of a protective cover (1) in accordance with the present invention for shielding a keyhole of a lock (30). The cover (1) includes a cap (10) having a crown (11) and a skirt (not numbered), and a pair of shutters (20) disposed in the cap (10) between the crown (11) and the lock (30).
The crown (11) defines a central through-hole (12) to be aligned with the keyhole and a pair of radial slots (13) at opposite sides of the through-hole (12). The skirt is intended to be connected to the lock (30) in a way rotatable around the keyhole. For example, the skirt may have an inner periphery formed with a plurality of protrusions (14) adjacent to a distal end thereof, while the lock (30) may define therein an annular groove (31), either continuous or discontinuous, i.e. interrupted into two portions, to receive the protrusions (14) and enable them to be turned a predetermined amount relative to the lock (30), as best shown in FIG. 2.
It is also necessary for the lock (30) to define a plurality of notches (32) open to the annular groove (31) in order to allow the protrusions (14) of the cap (10) to enter the groove (31).
Referring to FIGS. 1 and 3, the shutters (20) are configured to close the central throughhole hole (12) in the crown (11) of the cap (10), and are preferably of a symmetrically and complementarily curved shape as shown in FIG. 3.
The shutters (20) each have a first end and a second end, with the first ends formed with respective pintles (21) laterally extending towards the lock (30) and the second ends formed with respective stubs (22) laterally extending towards the crown (11) of the cap (10). In the illustrated embodiment, the lock (30) has a pair of diametrical bores (33) defined at sides of the keyhole to receive the pintles (21), thereby allowing the pintles (21) to pivot on the lock (30) diametrically about the key hole.
The stubs (22) of the shutters (20) are disposed in the radial slots (13) of the cap (10). Preferably, each of the radial slots (13) is formed with a pair of curved ends (15), for the purpose of stopping and holding a corresponding one of the stubs (22) after the cap (10) is fully turned in either direction.
Referring to FIG. 4, the central through-hole (12) in the crown (11) can be opened merely by turning the cap (10) in a first direction relative to the lock (30). At this time, the stubs (22) are guided by the radial slots (13) of the cap (10) in such a way that the shutters (20) are pivoted away from each other about their pintles (21), until the stubs (22) are stopped and held in the associated curved ends (15) of the slots (13). As a result, the keyhole of the lock (13) is exposed.
The central through-hole (12) in the crown (11) can be closed by turning the cap (10) in a second direction opposite to the first direction. Now the shutters (20) are pivoted towards each other about their pintles (21), until the stubs (22) are stopped and held in the other associated curved ends (15) of the slots (13), when the shutters (20) are shut and the keyhole is shielded, as shown in FIG. 3.
From the above description, it is noted that the invention has the following advantages:
1. being compact in structure:
Because the shutters (20) are turned in the same plane they are disposed to be in, the inventive cover (1) is compact in structure.
2. being simple in structure:
Because there is no spring, the inventive cover (1) is simple in structure.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
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|U.S. Classification||70/423, 70/455|
|International Classification||E05B13/02, E05B17/18|
|Cooperative Classification||E05B17/181, Y10T70/8649, Y10T70/7955, E05B17/185|
|Nov 18, 2005||FPAY||Fee payment|
Year of fee payment: 4
|Nov 20, 2009||FPAY||Fee payment|
Year of fee payment: 8
|Nov 20, 2013||FPAY||Fee payment|
Year of fee payment: 12